Wim van den Heever / Julia heleconia (Dryas julia) butterfly on head of Yacare caiman (Caiman yacare) Pantanal, Brazil.

Wim van den Heever / African elephant (Loxodonta africana) bull dust-bathing, Chyulu Hills, Kenya.

Anup Shah / African elephants (Loxodonta africana) gathering at a waterhole, wide angle view. Maasai Mara National Reserve, Kenya.

Anup Shah / African elephants (Loxodonta africana) wallowing at a waterhole, wide angle view. Maasai Mara National Reserve, Kenya.

Danny Green / Japanese cranes (Grus japonensis) displaying in snow, Hokkaido, Japan, February

Danny Green / Japanese cranes (Grus japonensis) displaying in snow, Hokkaido, Japan, February

Danny Green / Japanese cranes (Grus japonensis) displaying in snow, Hokkaido, Japan, February

Ole Jorgen Liodden / Erect-crested penguin (Eudyptes sclateri) surfacing near Bounty Island, Sub-Antarctic New Zealand, March. Endangered species.

Ole Jorgen Liodden / Hippopotamus (Hippopotamus amphibius) rearing head out of water, creating spray, Lake Naivasha, Kenya.

Tui De Roy / Emperor penguin (Aptenodytes forsteri) chicks, Amanda Bay, Prydz Bay, Ingrid Christensen Coast, East Antarctica, November.

Theo Webb / Female Bonobo (Pan paniscus) tickling her infant, Max Planck research site LuiKotale, Salonga National Park, Democratic Republic of Congo.

Chris & Monique Fallows / Wandering albatross (Diomedea exulans), feeding and cleaning.